Triumph Bonneville T120 and T100 Accessories and Exhaust Guide

The Bonneville: Style First, Always

The Triumph Bonneville T120 and T100 occupy a unique position in the market: they're modern motorcycles engineered to the standard of any contemporary machine, yet they look and feel like something from the 1960s. For owners of these bikes, accessories choices are always made through an aesthetic lens first. An upgrade that compromises the Bonneville's visual purity — however technically sound — is unlikely to appeal to the typical owner.

This guide covers exhaust options and accessories for both the T120 and T100 with that constraint firmly in mind. Everything here either maintains or enhances the bike's classic character.

T120 vs T100: What's Different for Accessories?

The T120 is the larger-engined, higher-spec model with a 1200cc parallel-twin producing 80bhp. The T100 runs the 900cc unit. Both use the same basic platform, which means most accessories — particularly exhausts and seat work — are compatible across both models. The T120's slightly higher power output makes exhaust tuning marginally more rewarding, but both bikes respond well to the same types of upgrade.

Exhaust Upgrades: Getting the Sound Right

The Bonneville's standard exhaust is a surprisingly good piece of engineering — it looks correct, sounds reasonable, and meets Euro 5 emissions requirements without obviously compromising performance. However, many owners want more of the classic British twin sound character: a deeper, more purposeful note that suits the bike's heritage.

Slip-on exhausts are the most straightforward approach. The best options for the Bonneville maintain the twin-pipe layout that's visually correct for the model — single-side exhausts that might look fine on a Street Triple look wrong on a Bonneville. Seek manufacturers who specifically design for the Bonneville and understand the aesthetic requirements.

Full system exhausts offer the most dramatic sound improvement and some weight savings, but require more careful consideration. Ensure any full system includes a catalytic converter or appropriate emissions management unless the bike will be used exclusively on private land.

Browse Triumph exhaust options for the Bonneville range.

Seat Upgrades: Comfort Without Compromise

The Bonneville's seat is a significant aesthetic element. The twin seat with its low-profile, flat design is correct for the period look and is part of what makes the bike identifiable. However, it's not designed for 300-mile days — the firm foam and limited base depth cause pressure point fatigue on longer rides.

Aftermarket seat options for the Bonneville broadly fall into two categories: those that maintain the standard appearance while improving comfort, and solo seats with a rear seat cowl that give a more café racer or scrambler appearance. For classic Bonneville owners who want to retain the original look, the former is the right choice.

A high-quality seat cover in period-appropriate materials — brown or black leather-effect finishes, for example — can modernise the feel without altering the classic appearance. Gel padding under the cover significantly improves long-distance comfort.

Find appropriate options in the Triumph seat covers collection.

Other Accessories Worth Considering

Beyond exhausts and seats, Bonneville owners most frequently invest in:

• Mirrors: Bar-end mirrors maintain the clean handlebar look better than stalk-mounted originals while improving rear visibility
• Headlight nacelle upgrades: Keeping the round headlight but improving its mounting quality
• Luggage: Leather-effect throw-over panniers that suit the aesthetic far better than hard cases
• Footpegs: Knurled aluminium or rubber-insert pegs that look period-correct and improve grip

What to Avoid

Avoid accessories that introduce modern styling elements that conflict with the Bonneville's character. Overly angular hard luggage, high-visibility bodywork additions, and aggressive-looking crash bars all compromise the visual coherence that makes the Bonneville appealing. There are tasteful options in all these categories — seek manufacturers who understand the classic market.

Shop Triumph Bonneville Accessories

Find exhausts and seat upgrades for your Bonneville at Triumph exhaust systems and Triumph seat covers.